| 摘要 |
An attachment for a traffic signal having a housing for fitting over one of the normal lights, herein the green light, of the signal and overriding the normal sequence in response to preemptive emergency signals, and a electro-optically responsive data display panel on the housing to provide clear and direct instructional messages to motorists as to the appropriate actions to be taken. A first embodiment overrides the normal green light with a reflective electro-optically responsive panel overlying the normal green light to become opaque in response to the emergency signals, with a red light source outside the panel that is activated to produce red reflected light. A second embodiment replaces the normal green (or alternatively yellow or red) signal with a panel of light-emitting elements (LEDs) that have one group capable of providing the normal green signals and a second group that are capable of providing graphic instructions in response to emergency signals. In both embodiments, the display panels provide alternate selections such as "STOP" or a halt symbol as one selection and an arrow or chevron pattern, with "RIGHT" or an abbreviation as a second selection.
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